“Coral Box” A100 Auto Top Off (ATO)

Coral Box A100 Auto Top Off allows you to automatically replenish evaporated water or refill after a small water change.

DC supply pump included.


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Coral Box A100 Auto Top Off

This Coral Box  Auto Top Off allows you to automatically replace evaporated water or refill after a small water change. This handy system will enable you to maintain water levels in aquariums and sumps. Water evaporation affects water quality increasing the parts per million (ppm) of dissolved solids which effects pH and salinity levels.

Water from the supply tank has a maximum head height of 200 cm at 150 L/hour. The supply pump itself has a safety float switch that shuts the pump off, sounds an alarm and flashes the “out of water” light when the supply tank level runs low.

A mounting bracket allows you to set the desired water level of a tank/sump when mounted on the glass. The water level in the tank/sump is controlled by an optical sensor in the first instance and as a backup, a second sensor is mounted above it to prevent overflow if the optical sensor should fail.

This Auto Top Off system goes a long way to achieving consistent water conditions along with the standard maintenance activities like cleaning filters and water changes.

Coral Box A100 Specifications:

DC supply pump – 5w, height 2m, 150 l/hr
Tank float switch
An optical sensor as the primary level sensor
Float switch sensor as a backup to prevent overflowing
Sensor and hose mounting brackets
2-meter flexible tubing 8/12mm


UltraLife DIRECT began more than two decades ago, and Our objective was to give hobbyist’s the ability to purchase quality products at a reasonable cost. Our parent company, UltraLife Reef Products, has been manufacturing innovative, high-quality products for aquariums and ponds for over 25 years and has become one of the top manufacturers in the industry.

Additional information

Weight2 lbs
Dimensions6 x 6 x 6 in


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